Tuning-pin.



No. 727,589. 7 PATENTBD MAY 12,1903.

A. J. GLEVBNGER & o. c. PIELD- TUNING PIN.

APPLIOATION FILED APR. 16. 1902.

H0 MODEL.

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UNITED STATES Patented May 12, 1902i.

PATENT OFFICE.

ADDISON J. CLEVENGER, OF ONTARIO, AND OI-IARLEs o. FIELD, OF sODUs, EW YORK.

TUNING-PIN.

SPEUIFIGATIQN forming part of Letters Patent N 0. 727,589, dated May 12, 1 903.

Application filed April 16, 1902. Serial No. 103,195. (No model.)

strings and to retain the instrument in tunev for a much longer period of time than is possible with the tuning-pins and methods of tuning in ordinary use.

With these and other objects in view the invention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a perspective view of a tuning-pin constructed in accordance with our invention, the pin being shown on an exaggerated scale in order to more clearly illustrate the construction. Fig. 2 is a longitudinal sectional elevation of the pin. Fig. 3 is a sectional plan View of the same on the line 3 3 of Fig. 2.

Similarnumerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

5 designates a pin proper having a slightlypointed lower end 6 and provided with the usual slightly-indented helical groove 7, the extreme upper end of the pin havinga rectangular and tapered portion for the reception of the ordinary tuning-wrench, which is applied inthe usual manner to turn the pin. At a suitable point in the pin, as at the point where the usual string-receiving opening is made, is a diametral perforation 9 for the reception of a pin 10, the opposite ends of which project slightly beyond the periphery of the pin, and above the pin 10 the periphery of the tuning-pin is provided with a threaded portion 11 for the reception of a nut 12, which may have a polygonal outer surface for the application of a suitable wrench, but is preferably formed as illustrated in the drawings, the upper edge of the nut being provided with recesses 13. adapted to receive depending lugs 14, forming part of a cylindrical wrench 15, which may be fitted over the upper end of the key.

16 designates the sleeve or collar, in which are formed two helically-disposed slots 17, adapted to receive the opposite ends of the pin 10, said slots extending in an inclined or curved line around the sleeve or collar for an angular distance about ninety degrees. On the periphery of the sleeve is a laterally-projecting pin 19, to which the end of the string may be secured.

In usingthe device the slightly-pointed end of the tuning-pin is inserted in the opening in the wrest-plank or other support and by the application of a suitable tuning-wrench the pin is turned, the string of course having been previously secured to the pin or lug 19. Owing to the resistance ofiered by the string, the pin 10 will be forced against the inner and lowermost ends of the groove 17 on each side of the sleeve and will remain in such position until the string has been properly stretched and is approximatelyin tune. The pin is then driven home in the usual manner. To then obtain the more delicate adjustment of the string without disturbing the tuningpin, the nut 12 is placed on the threaded portion of the tuning-pin and is turned by the application of the wrench 15. As the nut is forced down it comes into contact with the upper ends of the collar 16 and forces the latter downwardly, resulting in a slight turning movement of said collar as the inclined walls of slots 17 are pressed against the projecting ends of the cross-pin 10. The slots are of suffioientlength to permit a movement of the collar through an angle of aboutninetydegrees, so that it is possible to accurately adjustthe pitch of a string without loosening or turning the tuning-pin after the latter has once been secured in place. The screw-threads 11 are preferably of comparatively fine pitch and in clined to such a small extent that the wrench to remain in position to firmly lock said c0l lar in place: I

The construction of the device is such that it may be applied to pianofortes and other instruments now in use without any change in construction and at very little expense.

While the construction herein described, and illustrated in, the accompanying drawings, is the preferred form of the device, it is obvious that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the ad vantages of our invention.

Having thus described our invention, what we claim is- 1. In a device oi the class specified a pin member, a helically-grooved string-attaching collar carried thereby, a pin carried by the pin member and projectingintosaid grooves, and means 'for forcing the collar longitudinally of the said pin member.

2. In a device of the class specified, a pin member havinga projecting pin and provided with an upper threaded portion, an adjustable nut adapted to said threaded portion, and a I helically grooved string attaching sleeve mounted on the pin member and adapted to receive the ends or" said pin.

3. In a device of the class specified, a pin member having a projecting pin or lug, a string-attaching collar mounted on the pin memberand having a helical groove for the reception of said pin or lug, anut 12 adapted to an upperthreaded portion ofthe pin member and engaging the upper surface of the collar, said nut having a notched upper end, and a wrench having lugs adapted to engage said notches, substantially as specified.

4. In a device of the class specified, a pin member havingan upper tapered and angular end portion for engagement by a tuningwrench, said pin being provided with a diametral opening 9, a pin extending through said opening and having its opposite ends projecting beyond the periphery of the pin member, the upper portion of the pin being provided with screw-threads 11, a ring-nut 12 mounted on said screw-threads and having slots or recesses 13 in its upper edge, acylindrical wrench 15 having depending lugs 14 adapted to engage said slots or recesses, and a string-attaching sleeve adapted to be engaged by the nut, said sleeve having helical grooves 17 for the reception of the said ends of the pin 10, substantially as specified.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures in the presence of two witnesses.

ADDISON J. CLEVENGER. CHARLES C. FIELD. Witnesses:

H. M. SELLEOK, J. G. BARKER. 

